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If you run this before the provider is resolved, it will be `undefined` forever, won't it? It's resolved immediately.

You need to use `this.clusterOidcProviderId = cluster.core.oidcProvider.id`

Thanks for the reply <@U012UJTT55M> - but since oidcProvider is an optional field for `new eks.Cluster({})` , Typescript is throwing an error. So I tried `const clusterOidcProvider = cluster.core.oidcProvider as any` and then `this.eksHash = clusterOidcProvider.id.apply((oidcProviderId: any) =&gt; oidcProviderId.split('/').slice(-1)[0])` but it’s still undefined.

Also, even if `oidcProvider` is optional, wouldn’t the apply run as a callback when the `oidcProvider` value is eventually resolved? If that’s the case, `this.eksHash` should resolve to the right value, no?

Then you're going to have to postpone getting the value until you know it is there. There is a problem in that you're using the same code to handle two different cases: one where the provider will never be there, and one where it will be there but isn't there yet.

The apply runs when the Output is resolved. But the code you have can run even if the variable doesn't have an Output, in which case, the id will be immediately undefined.

You could try `if (cluster.core.oidcProvider != undefined) { this.eksHash = this.clusterOidcProviderId?.apply(oidcProviderId =&gt; oidcProviderId.split('/').slice(-1)[0]); }`